Contents of a package going out today. 10 Dichro and 25 Opal FX blanks. I had to stop because I ran out of materials for casting them. Picking up more this weekend (and ordering more Dichro soon).
developed for the space industry, it reflects and refracts light in two or more colors depending on the angles. In the one I linked to, all the pieces are the same color, but appear to shift between teal and green as the light hits them differently.
a lot of work to make work with the thinness of the kits.